We did the offer at the Sheraton Vistana a few years back. We were offered 3 nights at the Vistana for $199. When you went to the presentation, they gave back $100. The Vistana is an older property so we were given the choice to either drive ourselves or they would take us to the newer property for the sales talk. We drove ourselves so we wouldn't be held hostage. We just held our ground and kept saying no and we got out of there in just over 2 hours. It was well worth it to us to have 3 nights in a 1 bedroom apt very close to WDW for just $100. And, we were able to buy Disney tickets from them for a substantial discount. I don't remember what we paid, but we got 10 day tickets that did not expire and that came with the water parks and it was quite a bit less expensive than getting them at the gate.
The secret is not to be nice. Let them know ASAP that you are not interested and they won't waste much time on you.